Final answer:
Refraining from smoking cigarettes is the most effective healthy lifestyle choice among the provided options for decreasing the risk of pancreatic cancer.
Step-by-step explanation:
Engaging in certain healthy lifestyle choices can decrease the risk of pancreatic cancer, a disease known for its late diagnosis and high fatality rate. Among the options provided, refraining from smoking cigarettes is the most effective choice for reducing pancreatic cancer risk. This is supported by evidence that shows smoking is a major risk factor and is attributable to about one in four cases of pancreatic cancer. Moreover, a well-balanced diet, regular exercise, and limited alcohol intake also contribute to a reduced risk of cancer in general, including pancreatic cancer.